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ID:44934454
大小:92.50 KB
页数:11页
时间:2019-11-05
《电子教案统一模板(模具)Unit7》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、Unit7TheCNCMachiningEquipmentLesson17TypesofCNCMachiningEquipment7.1Lesson18CNCTurningCenter7.2ReadingMaterials17TheAdvantagesofCNCMachines7.3ReadingMaterials18TheDisadvantagesofCNCMachines7.47.1Lesson17TypesofCNCMachiningEquipmentMachiningcentersarethelatestdevelopmentinCNCte
2、chnology.Thesesystemsareequippedwithautomatictoolchangerswiththecapabilityofchangingupto90ormoretools.[1]Manymachiningcentersarealsofittedwiththemovablerectangularworktablescalledpallets.Thepalletsareusedtoautomaticallyloadandunloadworkpieces.Atasinglesetupmachiningcenterscanp
3、erformsuchoperationsasmilling,drilling,tapping,boring,andsoon.[2]Additionallyutilizingindexingheads,somecentersarecapableofexecutingthesetasksonmanydifferentfacesofapartatspecifiedangles.Turningcenterswithincreasedcapacitytoolchangersarealsomakingstrongappearanceinmodernproduc
4、tionshops.[3]TheseCNCmachinesarecapableofexecutingmanydifferenttypesoflathecuttingoperationssimultaneouslyonrotatingpart.Inadditiontomachiningcentersandturningcenters,CNCtechnologyhasalsobeenappliedtomanyothertypesofmanufacturingequipment.Thesearewireelectricaldischargemachine
5、s(WEDM)andlasercuttingmachinesandsoon.WEDMmachinesutilizeaverythinwireasanelectrode.Thewireisstretchedbetweentworollersandcutsthepartlikeaband-saw.Materialisremovedbytheerosioncausedbyasparkthatmoveshorizontallywiththewire.CNCisusedtocontrolhorizontaltablemovements.WEDMmachine
6、sareveryusefulforproducingmoldinserts,extrusionandtrimdiesaswellasformingtools.[4]LasercuttingCNCmachinesutilizeanintensebeamoffocusedlaserlighttocutthepart.Materialunderthelaserbeamundergoesarapidriseintemperatureandisvaporized.Ifthebeampowerishighenough,itwillpenetratethroug
7、hthematerial.Becausenomechanicalcuttingforcesareinvolved,laserscutpartswithaminimumofdistortion.Theyhavebeenveryeffectiveinmachiningslotsanddrillingholes.7.2Lesson18CNCTurningCenterCNCturningcenters,unlikechuckingcenters,aremainlydesignedformachiningshaft-typeworkpieceswhichar
8、esupportedbyachuckandaheavy-dutytailstockcenter.Onfour-axisma
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